Lots of ??? for 1987 RX-7
02-10-09, 02:54 PM
#1
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Lots of ??? for 1987 RX-7
I'm a little new to these forums, but have got alot of help just using them. I have an 1987 RX-7 and have been searching for some help, but could never find what I wanted answered.
I have a S4 Engine NA w/ 80,000 and I want to go turbo after I get out of boot camp and tech school. First question I would like to discuss is which engine is better for reliabilty and performance... the S4 Turbo or the S5 Turbo.
Next question is for which ever block can you use either tranny off the S4 or S5? Is one better than the other?
Which is a better rear end for a Turbo setup?
Thanks for your help!
I have a S4 Engine NA w/ 80,000 and I want to go turbo after I get out of boot camp and tech school. First question I would like to discuss is which engine is better for reliabilty and performance... the S4 Turbo or the S5 Turbo.
Next question is for which ever block can you use either tranny off the S4 or S5? Is one better than the other?
Which is a better rear end for a Turbo setup?
Thanks for your help!
02-10-09, 03:00 PM
#2
well i cant really answer the first question as i do not have the knowledge of turbo'd s4 and s5 engines are, but the s5 rotors have higher compression, so i have heard / read.
the 2nd question. everyone will tell you the TII trannies are the way to go. just make sure it fits. someone feel free to correct me if im wrong.
and for the last one, the TII rear end with the TII tranny and everything else.
heck you might as well just do a TII swap instead of turbo-ing a n/a engine.
the 2nd question. everyone will tell you the TII trannies are the way to go. just make sure it fits. someone feel free to correct me if im wrong.
and for the last one, the TII rear end with the TII tranny and everything else.
heck you might as well just do a TII swap instead of turbo-ing a n/a engine.
02-10-09, 03:04 PM
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Yea I'm planning on swaping the engine out, becuase I think I heard that S5's are better. Thanks for giving me an idea about the tranny and rear end. Do you know if one is stronger than the other though, like better stronger parts?
02-10-09, 03:23 PM
#4
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Ok I am 95% sure that the s4 and s5 t2 tranny's would both bolt directly up to a s4 or s5 t2 engine. Also both are the same the s4 and s5 t2trannies that is. The differences in engine is that The s5 engine has more horse power as for reliability they will both have the same amount of wear depending on what you do... Example you put race exhaust on s4 or s5 same result and same wear...
Anyone feel to correct me too if I am wrong.
If your engine is good why not turbo it. Why scrap a perfectly good angine. Turbo your n/a 6 port, then if you blow your engine then go t2. I have s5 n/a turbo right now. If this engine goes then I will still stay s5 na turbo. Higher compression and can build it faster.
Chack out this thread about 6port turbo or t2 swap it was started by me.. You just might find the n/a turbo is better.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/t2-swap-6port-w-turbo-pros-cons-help-818424/
Anyone feel to correct me too if I am wrong.
If your engine is good why not turbo it. Why scrap a perfectly good angine. Turbo your n/a 6 port, then if you blow your engine then go t2. I have s5 n/a turbo right now. If this engine goes then I will still stay s5 na turbo. Higher compression and can build it faster.
Chack out this thread about 6port turbo or t2 swap it was started by me.. You just might find the n/a turbo is better.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/t2-swap-6port-w-turbo-pros-cons-help-818424/
Last edited by MazdaRX7.ws; 02-10-09 at 03:35 PM. Reason: corrected grammar
02-10-09, 03:25 PM
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Welcome to the forums. A big thing here, and probably the best thing for you, is practice digging around for information. You learn A LOT more that way, and you manage to stay on everyones good side 
http://www.rotaryresurrection.com/2n...turbo2.html#q2
It's about 4/5ths down the page
So basically, as long as it's turbo, and you have the right flywheel, you should be gravy.
http://www.rotaryresurrection.com/2n...turbo2.html#q2
It's about 4/5ths down the page
You CANNOT mix and match any of these parts with nonturbo parts. Everything is different. You either change ALL the parts listed above, or none of them. Note that other than the flywheel, the drivetrain parts really arent specific to any year. Basically the only small changes made to these parts from 87-91 do not matter to performance. In otherwords, it doesnt matter if you buy an 87 transmission and a 91 rearend, or any other combination, it'll still work just fine.
02-10-09, 03:45 PM
#6
If you swap in a turbo engine:
The S5 turbo is rated at ~13 more hp than the S4 turbo because it runs 7.5psi max instead of 5.5psi AND it has 9:1 rotors instead of 8.5:1. The biggest effect is from the boost being higher, so don't waste your time trying to do a series swap (S4 -> S5) since you can just use a boost controller to make the S4 just as powerful.
If you turbo a 6-port NA block:
Use an S4 block not an S5. You don't want to deal with 9.7:1 rotors on a turbo application. Especially if you're going to go the cheap route with no standalone EMS.
As for transmissions, S4 and S5 TII transmissions are basically identical. I have one of each, but used an S5 because it was in better condition. As pointed out, drivetrain parts are fairly interchangeable.
The S5 turbo is rated at ~13 more hp than the S4 turbo because it runs 7.5psi max instead of 5.5psi AND it has 9:1 rotors instead of 8.5:1. The biggest effect is from the boost being higher, so don't waste your time trying to do a series swap (S4 -> S5) since you can just use a boost controller to make the S4 just as powerful.
If you turbo a 6-port NA block:
Use an S4 block not an S5. You don't want to deal with 9.7:1 rotors on a turbo application. Especially if you're going to go the cheap route with no standalone EMS.
As for transmissions, S4 and S5 TII transmissions are basically identical. I have one of each, but used an S5 because it was in better condition. As pointed out, drivetrain parts are fairly interchangeable.
02-10-09, 04:17 PM
#7
well rested,buffet o food
You will have a mess if you try to swap in an s5. So for you and most s4 owners (myself included), an s4 swap is best for reliability (using na harness with tps extended has given me NO issues) and performance (you wil finish the car in a weekend or so as opposed to forever...like a lot of abandoned s5 swapped s4s i have seen) So i say performance, meaning a running t2 s4 swap will out perform a nonrunning s5 
.
Depending on your goals, keeping your na drivetrain will not give you any issue either.
I have chris browned the **** out of my se drivetrain for about two years now 160,000 miles. Just dont skimp on a beefy na clutch. People dont give the na drivetrain enough credit.... i stand on my ****.
good luck with the build.
john ny
. Depending on your goals, keeping your na drivetrain will not give you any issue either.
I have chris browned the **** out of my se drivetrain for about two years now 160,000 miles. Just dont skimp on a beefy na clutch. People dont give the na drivetrain enough credit.... i stand on my ****.
good luck with the build.
john ny
Trending Topics
02-10-09, 04:32 PM
#8
LTDuvall.USAF, what are your goals with this car? Do you just want to say you have a turbo vehicle, or are you trying to make 300+ HP?
S5 motors are stronger motors once you break about 350 HP. IF you aren't planning to go that high, an S4 motor is fine.
S5 turbos are slightly better turbos, they are slightly larger. Most people can't tho.
With out knowing your goals and intentions for this car, I would strongly recommend selling it and buying a turbo car
or
buying a turbo car with a damaged body and swapping over EVERYTHING to the cleaner body.
If you use the search function on this site, you'll see that EVERY question you've asked has been answered in depth. Much of the replies on this thread are very vague, or incorrect. So search and read more in-depth threads.
Welcome to the site, enjoy your Wankle
S5 motors are stronger motors once you break about 350 HP. IF you aren't planning to go that high, an S4 motor is fine.
S5 turbos are slightly better turbos, they are slightly larger. Most people can't tho.
With out knowing your goals and intentions for this car, I would strongly recommend selling it and buying a turbo car
or
buying a turbo car with a damaged body and swapping over EVERYTHING to the cleaner body.
If you use the search function on this site, you'll see that EVERY question you've asked has been answered in depth. Much of the replies on this thread are very vague, or incorrect. So search and read more in-depth threads.
Welcome to the site, enjoy your Wankle
02-10-09, 04:45 PM
#9
before you do anything type of swapping and changing.. make sure you do lots and lots of READING. read research and read some more.. also make sure you have a hp goal. you'll waste a lot of money if you keep changing routes like i did.. lol
02-10-09, 05:02 PM
#10
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I would like to say thanks for all the post it has given me more info that I needed to know. I would also like to say that I have been planning on joining this forum but have been lazy on making an account haha. I dug around alot and just don't understand how to search I guess yet, so i decided to make an account and add my car to this club's collection. I appreciate the help though and with practice makes perfect in the forum world.
The thing is my brother gave me this car as a base model 13B NA. I have always wanted a ricer (aka civic, etc.) and never dreamed of getting so lucky with a rotary. The car is in GREAT condition considering I only paid 1600 for it. My plans was to build it into a street machine and since it is in tip top shape I wanted to start with a turbo. I heard you can put a turbo on an NA, but i'll just have to dig around on that since yall said it would be better. I do though want to push high with the horses later down the road, but goals right now are getting back to original condition which there is not much left and then do a turbo, tein suspension, exhaust, etc. etc. you guys understand. When I hit a stopping point in power though I will haha want more. 300+ is def what I see in the next couple years, but then after I get use to it the LS1 has been calling my name (but don't respond on that note becuase it will be a while)
My next question is (which I have found out, but couldn't find all I needed) I have a water leak which only happens when it rains. The water builds up mostly behind the passenger seat and some behind the driver seat. I'm thinking from my research that its coming from the sunroof. I checked it out today trying to find the drainage tube or w/e and could not figure out how to get to them... damn its suppose to rain tomorrow
Got any ideas just let me know and thanks again everyone!
I should get 5 post for this haha!
I appreciate the help though and with practice makes perfect in the forum world.LTDuvall.USAF, what are your goals with this car? Do you just want to say you have a turbo vehicle, or are you trying to make 300+ HP?
S5 motors are stronger motors once you break about 350 HP. IF you aren't planning to go that high, an S4 motor is fine.
S5 turbos are slightly better turbos, they are slightly larger. Most people can't tho.
With out knowing your goals and intentions for this car, I would strongly recommend selling it and buying a turbo car
or
buying a turbo car with a damaged body and swapping over EVERYTHING to the cleaner body.
If you use the search function on this site, you'll see that EVERY question you've asked has been answered in depth. Much of the replies on this thread are very vague, or incorrect. So search and read more in-depth threads.
Welcome to the site, enjoy your Wankle
S5 motors are stronger motors once you break about 350 HP. IF you aren't planning to go that high, an S4 motor is fine.
S5 turbos are slightly better turbos, they are slightly larger. Most people can't tho.
With out knowing your goals and intentions for this car, I would strongly recommend selling it and buying a turbo car
or
buying a turbo car with a damaged body and swapping over EVERYTHING to the cleaner body.
If you use the search function on this site, you'll see that EVERY question you've asked has been answered in depth. Much of the replies on this thread are very vague, or incorrect. So search and read more in-depth threads.
Welcome to the site, enjoy your Wankle
My next question is (which I have found out, but couldn't find all I needed) I have a water leak which only happens when it rains. The water builds up mostly behind the passenger seat and some behind the driver seat. I'm thinking from my research that its coming from the sunroof. I checked it out today trying to find the drainage tube or w/e and could not figure out how to get to them... damn its suppose to rain tomorrow
Got any ideas just let me know and thanks again everyone!
I should get 5 post for this haha!
02-10-09, 05:13 PM
#11
my opinion, keep cleaning up the car, take care of the leak and any other problems. Do the suspension all out, try not to spend any money upgrading the motor or exhaust. If you want to do the turbo swap, buy a turbo motor, turbo drivetrain and tranny, turbo ECU or standalone, and the turbo of coarse.
There are tons of threads on all this stuff, search.
Go https://www.rx7club.com/2nd-generation-specific-1986-1992-17/
the top right corner below the advertisement says "Search this Forum"
There are tons of threads on all this stuff, search.
Go https://www.rx7club.com/2nd-generation-specific-1986-1992-17/
the top right corner below the advertisement says "Search this Forum"
02-10-09, 05:23 PM
#12
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my opinion, keep cleaning up the car, take care of the leak and any other problems. Do the suspension all out, try not to spend any money upgrading the motor or exhaust. If you want to do the turbo swap, buy a turbo motor, turbo drivetrain and tranny, turbo ECU or standalone, and the turbo of coarse.
There are tons of threads on all this stuff, search.
Go https://www.rx7club.com/forumdisplay.php?f=17
the top right corner below the advertisement says "Search this Forum"
There are tons of threads on all this stuff, search.
Go https://www.rx7club.com/forumdisplay.php?f=17
the top right corner below the advertisement says "Search this Forum"
And I am new and slow to learning about forums, but I know about the search button. I've been searching for a year now and finally decided to make an account to ask someone in person. Plus I seen other threads and I already know that I will hear "search" alot, lol!
02-10-09, 06:07 PM
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Well no posts, so I'm still searching about leaking (feel free to drop something though to help out), but now I was wondering something else. I like ripping off the stuff that is useless... what can you rip off the engine that you really just need for Emissions? Thanks, because that will be tomorrows job.
02-10-09, 10:33 PM
#14
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the drainage tubes run in the Corners of the Sunroof,Down the Front Via the Windshield Sills(pillars).
you will get an Idea of it better IF you take the sunroof assembly Completely off..BUT!,Hold on!..I think your leak may be something else!.Some other member had the same thing Happening..(dammit,Brain fart,old age!).
You'll have to Search Sorry, LT....Try these terms: "leaks,Interior Leaks,passenger side leaks,water in Passenger side".something along those lines.Good luck to ya.STYX!~
you will get an Idea of it better IF you take the sunroof assembly Completely off..BUT!,Hold on!..I think your leak may be something else!.Some other member had the same thing Happening..(dammit,Brain fart,old age!).
You'll have to Search Sorry, LT....Try these terms: "leaks,Interior Leaks,passenger side leaks,water in Passenger side".something along those lines.Good luck to ya.STYX!~
02-11-09, 12:54 AM
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the drainage tubes run in the Corners of the Sunroof,Down the Front Via the Windshield Sills(pillars).
you will get an Idea of it better IF you take the sunroof assembly Completely off..BUT!,Hold on!..I think your leak may be something else!.Some other member had the same thing Happening..(dammit,Brain fart,old age!).
You'll have to Search Sorry, LT....Try these terms: "leaks,Interior Leaks,passenger side leaks,water in Passenger side".something along those lines.Good luck to ya.STYX!~
you will get an Idea of it better IF you take the sunroof assembly Completely off..BUT!,Hold on!..I think your leak may be something else!.Some other member had the same thing Happening..(dammit,Brain fart,old age!).
You'll have to Search Sorry, LT....Try these terms: "leaks,Interior Leaks,passenger side leaks,water in Passenger side".something along those lines.Good luck to ya.STYX!~
02-12-09, 08:30 AM
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Ok I hope this works but back to the Water Leak... I noticed but never took this part in, I have a gap on the front of the seal that goes around my sunroof. I don't have a digi camera, but I made a paint file to try to explain.
Must Click to zoom it bigger!
The white spot is where the gap is... is this suppose to be this way. I don't think it is and I think this is the problem.
Let me know, Thanks!!!
Must Click to zoom it bigger!
The white spot is where the gap is... is this suppose to be this way. I don't think it is and I think this is the problem.
Let me know, Thanks!!!
Last edited by LTDuvall.USAF; 02-12-09 at 08:31 AM. Reason: small picture... need to click to zoom it
02-12-09, 05:38 PM
#18
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Since I get no answer... its cool! I love how the help and kindness is so nice here. For all you willing to look at the forum for now on and not help a simple question which i have no knowledge, I wish you would spend a little more extra time looking at my last post in this thread! I see that most RX-7 Owners.... naw most "High Rated Forum Posters" think they are better than us, knowledge yes, but I think thats why I'm here asking... but the truth is, you need to move out of mom's house and break some rules. There is a world outside of this thing yall act like is your world. Get a life. Forums are for help and friendship, not for a competition. Theres no high, middle, or low class people here. Its just words of wisdom from the wise and curious george's confused! Grow some *****... expecially the ones that will say something negative right after this post. Yea there are dumb people, but learning and asking questions makes us smarter.
Thanks and I don't care if my thread is locked, deleted, and my post count starts at 0, I just want help from a teacher and not no momma's boy! Some 30 year old, fat, loser, internet bully!!!
Done!
So sadd you guys! Why were forums made? To help people or To win 1st place? Theres no excuses for that question, because you smart asses know the answer!!
Thanks and I don't care if my thread is locked, deleted, and my post count starts at 0, I just want help from a teacher and not no momma's boy! Some 30 year old, fat, loser, internet bully!!!
Done!
So sadd you guys! Why were forums made? To help people or To win 1st place? Theres no excuses for that question, because you smart asses know the answer!!
02-12-09, 05:51 PM
#19
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Hey Ill help as much as i can. As for the turbo thing you should deff. do a turbo motor swap due to the fact that n/a motors dont do all that well as turbo without crazy mods. There was a guy on this forum that did a n/a to turbo conv. and it cost him a crap load and took him a long time so i deff. think turbo motor swap would be better. And i personally think the s4 stuff would be easier to deal with. Also i dont really know how to solve your leaking problem but the thing that sucks is i have the same problem as you do and i changed the seals and nothing worked so ill check back to see if anybody else knows. But keep your head up there are some dicks on this forum but others really are helpful
02-13-09, 04:23 PM
#20
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Aaroncake did a 6port turbo conversion (he added a turbo to his N/A engine). it took lots of fabrication...the big thing was making a spacer for the turbo manifold (there isnt enough room to mount the stock t2 turbo manifold under the stock N/A manifold...It sticks out too much......Then you'd have to consider how to run your intercooler piping.......Others have used the N/A keg with a t2 intake manifold system...this is probably the easiest way for most to do the 6port turbo set up.....ofcourse there are other details that would need to be addressed with this type of set up
02-13-09, 06:36 PM
#21
(NA to Turbo engine swap)
https://www.rx7club.com/2nd-gen-archive-72/s4-na-turbo-swap-details-813825/
Feel free to PM me any miscelanious questions
https://www.rx7club.com/2nd-gen-archive-72/s4-na-turbo-swap-details-813825/
Feel free to PM me any miscelanious questions
02-13-09, 07:22 PM
#22
there have been no negative comments toward you or anyone in this thread, so I am not sure why you are complaining.
There are a couple of reasons you aren't getting answers in this thread,
One: they've all been asked 1000 times before. People (including myself) have given you basic info regarding your questions and invited you to search the forums yourself, until you have an in depth question regarding your swap.
Two: Your thread is vague... you maybe want to do this, but maybe this instead, but not if this is this... Ask a specific question and you'll get in depth answers.
Three: You are incessantly asking about that leak in your sunroof, but your thread title doesn't reflect this issue. No one that knows anything about leaking sun roofs even know your problem exists.
When you have a specific problem, it would be wise to start a specific thread regarding that issue. Most knowledgeable people here will not troll through all the BS threads titled "I haven't searched but answer all my questions"
Happy threading
There are a couple of reasons you aren't getting answers in this thread,
One: they've all been asked 1000 times before. People (including myself) have given you basic info regarding your questions and invited you to search the forums yourself, until you have an in depth question regarding your swap.
Two: Your thread is vague... you maybe want to do this, but maybe this instead, but not if this is this... Ask a specific question and you'll get in depth answers.
Three: You are incessantly asking about that leak in your sunroof, but your thread title doesn't reflect this issue. No one that knows anything about leaking sun roofs even know your problem exists.
When you have a specific problem, it would be wise to start a specific thread regarding that issue. Most knowledgeable people here will not troll through all the BS threads titled "I haven't searched but answer all my questions"
Happy threading
02-15-09, 03:00 PM
#23
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there have been no negative comments toward you or anyone in this thread, so I am not sure why you are complaining.
There are a couple of reasons you aren't getting answers in this thread,
One: they've all been asked 1000 times before. People (including myself) have given you basic info regarding your questions and invited you to search the forums yourself, until you have an in depth question regarding your swap.
Two: Your thread is vague... you maybe want to do this, but maybe this instead, but not if this is this... Ask a specific question and you'll get in depth answers.
Three: You are incessantly asking about that leak in your sunroof, but your thread title doesn't reflect this issue. No one that knows anything about leaking sun roofs even know your problem exists.
When you have a specific problem, it would be wise to start a specific thread regarding that issue. Most knowledgeable people here will not troll through all the BS threads titled "I haven't searched but answer all my questions"
Happy threading
There are a couple of reasons you aren't getting answers in this thread,
One: they've all been asked 1000 times before. People (including myself) have given you basic info regarding your questions and invited you to search the forums yourself, until you have an in depth question regarding your swap.
Two: Your thread is vague... you maybe want to do this, but maybe this instead, but not if this is this... Ask a specific question and you'll get in depth answers.
Three: You are incessantly asking about that leak in your sunroof, but your thread title doesn't reflect this issue. No one that knows anything about leaking sun roofs even know your problem exists.
When you have a specific problem, it would be wise to start a specific thread regarding that issue. Most knowledgeable people here will not troll through all the BS threads titled "I haven't searched but answer all my questions"
Happy threading
Happy threading to you 2!
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